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A300868 Lexicographically earliest sequence of distinct positive terms such that, for any n > 0, n * a(n) is a Fibbinary number (A003714). 2

%I #14 Aug 22 2021 13:17:50

%S 1,2,3,4,8,6,12,5,9,13,15,7,10,19,11,16,17,18,14,26,32,24,23,22,41,20,

%T 38,39,36,43,44,21,33,34,59,29,64,27,28,52,25,49,30,31,53,46,47,48,42,

%U 82,51,40,45,76,96,78,72,73,35,71,84,75,86,37,65,66,70

%N Lexicographically earliest sequence of distinct positive terms such that, for any n > 0, n * a(n) is a Fibbinary number (A003714).

%C This sequence is a self-inverse permutation of the natural numbers.

%H Rémy Sigrist, <a href="/A300868/b300868.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%H Rémy Sigrist, <a href="/A300868/a300868.png">Colored logarithmic scatterplot of the first 2^15 terms</a> (where the color is function of A070939(n * a(n)))

%H Rémy Sigrist, <a href="/A300868/a300868.txt">C++ program for A300868</a>

%e The first terms, alongside the binary representation of n * a(n), are:

%e n a(n) binary(n * a(n))

%e -- ---- ----------------

%e 1 1 1

%e 2 2 100

%e 3 3 1001

%e 4 4 10000

%e 5 8 101000

%e 6 6 100100

%e 7 12 1010100

%e 8 5 101000

%e 9 9 1010001

%e 10 13 10000010

%e 11 15 10100101

%e 12 7 1010100

%e 13 10 10000010

%e 14 19 100001010

%e 15 11 10100101

%e 16 16 100000000

%e 17 17 100100001

%e 18 18 101000100

%e 19 14 100001010

%e 20 26 1000001000

%o (C++) See Links section.

%Y Cf. A003714, A070939.

%K nonn,look,base

%O 1,2

%A _Rémy Sigrist_, Mar 14 2018

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)